Mild. Mild reactions include fever, sluggishness, and loss of appetite. Mild reactions are probably also related to an immune reaction from a vaccination. They usually resolve without treatment.
Moderate. Swelling of t he face is a moderate vascular reaction of the skin marked by hives or wheals and rapid swelling and redness of the lips, around the eyes, and in the neck region. It is usually extremely itchy. It may progress to anaphylaxis and is considered life-threatening. This is the most common reaction.
Anaphylaxis is an extreme emergency and it occurs soon after being stung. Your veterinarian will begin immediate emergency life support. This will include establishing an open airway, administering oxygen, and intravenous fluids to increase blood pressure. He will probably administer drugs such as epinephrine and corticosteroids. Animals that survive the first few minutes usually return to normal health.
If your dog is known to be allergic to stinging insects, your veterinarian may recommend that you administer Benadryl® in the early stages of the allergic reaction. Unfortunately, oral medication may not be sufficient, and you will have to take your dog in for examination and treatment.